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689913 = 32747233
BaseRepresentation
bin10101000011011111001
31022001101100
42220123321
5134034123
622442013
75602260
oct2503371
91261340
10689913
11431384
12293309
131b2043
1413d5d7
15d9643
hexa86f9

689913 has 24 divisors (see below), whose sum is σ = 1168128. Its totient is φ = 384192.

The previous prime is 689903. The next prime is 689917. The reversal of 689913 is 319986.

It is not a de Polignac number, because 689913 - 210 = 688889 is a prime.

689913 is a lucky number.

It is a nialpdrome in base 15.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 689913.

It is not an unprimeable number, because it can be changed into a prime (689917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2845 + ... + 3077.

It is an arithmetic number, because the mean of its divisors is an integer number (48672).

2689913 is an apocalyptic number.

689913 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

It is an amenable number.

689913 is a deficient number, since it is larger than the sum of its proper divisors (478215).

689913 is a wasteful number, since it uses less digits than its factorization.

689913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293 (or 290 counting only the distinct ones).

The product of its digits is 11664, while the sum is 36.

The square root of 689913 is about 830.6100167949. The cubic root of 689913 is about 88.3618451531.

The spelling of 689913 in words is "six hundred eighty-nine thousand, nine hundred thirteen".

Divisors: 1 3 7 9 21 47 63 141 233 329 423 699 987 1631 2097 2961 4893 10951 14679 32853 76657 98559 229971 689913